Top U.S. and Ukrainian officials said Sunday they'd made progress toward ending the Russia-Ukraine war but provided scant details after discussing the American proposal to achieve peace.

A proposed peace plan for Ukraine led by the United States has been met with anguish by many Ukrainians, who fear a post-war amnesty for Russian forces would erase accountability for alleged atrocities.

The president also took aim at former President Joe Biden, arguing that Putin only attacked Ukraine because Biden was president at the time.

As for Mr Trump, he again betrayed his underlying bias: sympathy for Russia and indifference to Ukraine. Ahead of the Geneva talks he dismissively said Mr Zelensky “can continue to fight his little heart out” if no agreement were reached, and complained on social media that “UKRAINE ‘LEADERSHIP’ HAS EXPRESSED ZERO GRATITUDE FOR OUR EFFORTS.”

Polish Prime Minister Donald Tusk said “it would be good to know for sure who is the author of the plan,” as tensions over elements that mirror long-standing Russian demands.

US Secretary of State Marco Rubio projected optimism on Sunday after what he described as productive discussions between American and Ukrainian officials in Geneva, Switzerland, aimed at stopping the war in Ukraine.

Former U.S. Amb. to NATO Kurt Volker analyzes President Donald Trump’s latest Russia-Ukraine peace plan on ‘Fox Report.’